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Intensity based optical fiber sensors for calcium detection

M. YASIN1,* , S. SOELISTIONO1, Y. G. YHUN YHUWANA1, M. KHASANAH2, H. AROF3, N. IRAWATI4, S. W. HARUN3,4,*

Affiliation

  1. Department of Physics, Faculty of Science and Technology, Airlangga University, Surabaya (60115), Indonesia
  2. Department of Chemistry, Faculty of Science and Technology, Airlangga University, Surabaya (60115), Indonesia
  3. Department of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
  4. Photonic Research Centre, University of Malaya, 50603 Kuala Lumpur, Malaysia

Abstract

Two optical fiber sensors are proposed and demonstrated for monitoring calcium concentration in a liquid solution. The first sensor utilizes a bundle plastic optical fiber (POF) as a probe. The system comprises fiber optic transmitter, fiber optic probe which consists of 1000 cores as a receiver, mirror reflection, photodiode detector, lock-in amplifier and computer.The measurementis based on the peak voltage of the output which increases with the calcium concentration of the solution varying from 0 to 2.5%. It is found that the peak voltage of the detector increases with the calcium concentration due to the scattering effects which allow more photons to be collected by the receiver. The sensitivity of the bundled POF based sensor is obtained at 4.321mV/% with a resolution of 0.05%. The second sensor employs a silica microfiber as a probe. The system consists of an amplified spontaneous emission (ASE) light source, microfiber probe and optical spectrum analyzer (OSA). The transmitted light intensity is observed to decrease with the increase in calcium concentration due to the change in the refractive index of the solution. The sensitivity of the second sensor is obtained at 2.4dB/% with a resolution of 0.8%. Both sensors show a good stability and high sensitivity. They are simple in design and low in fabrication cost, which are appropriate for chemical, biomedical, pharmaceutical and process control applications..

Keywords

Fiber optic, Fiber optic displacement sensor, Calcium concentration, Intensity modulation.

Citation

M. YASIN, S. SOELISTIONO, Y. G. YHUN YHUWANA, M. KHASANAH, H. AROF, N. IRAWATI, S. W. HARUN, Intensity based optical fiber sensors for calcium detection, Optoelectronics and Advanced Materials - Rapid Communications, 9, 9-10, September-October 2015, pp.1185-1189 (2015).

Submitted at: Aug. 19, 2015

Accepted at: Sept. 9, 2015